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They worried about the purity of tap water.
他们担心自来水是否洁净。
《柯林斯英汉双解大词典》
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Complete subboiling system for production of high purity acids and water;
亚沸设备，用于提取高纯度的酸和水。
youdao
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Complete subboiling system for production of high purity acids and water;
亚沸设备，用于提取高纯度的酸和水。
youdao